40s – One hour of weight training 3 days a week if you do your whole body at once (4 days for half an hour if you split it up), plus 45 minutes of cardio five days a week (it's more than in the 20s and 30s but with less impact and intensity). Take one day off.
This is the time of your life when it is most important to have an exercise routine. Our bodies naturally start to decline in middle age. Our muscles begin to lose mass and elasticity. This slows our metabolism and makes it easier to gain weight. During this time, both men and women start experiencing dropping hormone levels. This also makes it easier to gain weight, especially around the abdomen. This kind of weight increases your risk of developing health problems. These could include high blood pressure, diabetes, and heart disease. Exercise is the best way to fight all these changes. Keep up with your cardio workouts, 3 to 5 times a week. If you have pain in your joints, switch to low-impact activities. These could include biking or swimming. But keep in mind that weight-bearing activities, such as walking or jumping, are important during this time. They can help you maintain strong bones and fight age-related bone loss. Be sure to keep up your muscle-strengthening routines, as well.